CN114350334B - High-temperature-resistant tough well cementation cement slurry system - Google Patents
High-temperature-resistant tough well cementation cement slurry system Download PDFInfo
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Abstract
The invention discloses a high-temperature-resistant tough well cementation cement slurry system, and relates to the technical field of well cementation materials for oil and gas field development. The well cementation cement slurry system comprises the following raw materials in percentage by weight: low hydration heat cement: 47wt% -60 wt%; high temperature strength stabilizing material: 25wt% -30 wt%; high-temperature strength reinforcing material: 10wt% -15 wt%; high-temperature toughening material: 2wt% -5 wt%; high-temperature stabilizer: 2wt% and 0.5wt% of dispersant; the high-temperature strength reinforcing material is a mixture formed by mixing silicon nitride micro powder and organic silicon resin micro powder; the high-temperature toughening material is polyether-ether-ketone resin. The high-temperature-resistant tough well cementation cement slurry system has the advantages of high-temperature-resistant strength decay and high toughness, can effectively relieve the problems of strength decay and insufficient toughness of set cement under the high-temperature condition, and meets the well cementation requirement of oil and gas wells.
Description
Technical Field
The invention belongs to the technical field of oil and gas field development and well cementation materials, and particularly relates to a high-temperature-resistant tough well cementation cement slurry system.
Background
With the increasing depletion of shallow layer oil and gas resources, the exploration and development of oil and gas resources gradually move to deep strata, and the number of deep wells and ultra-deep wells is increasing year by year. Along with the increase of the depth of the oil-gas well, high-temperature deep wells and ultra-deep wells with the bottom temperature of more than 200 ℃ are gradually increased, and higher requirements on the performance of cement paste are provided at high temperature and ultrahigh temperature. Particularly, under the ultrahigh temperature environment, the problems of a conventional silicate sand-added cement slurry system in China are exposed, and the problems of the decay of the high-temperature strength of the set cement, the poor cracking and the like are particularly prominent. Foreign companies such as Schlumberger, haributton and the like have silicate cement slurry systems with temperature resistance over 200 ℃, and domestic silicate cement slurry systems with temperature over 200 ℃ and stable comprehensive performance are lacked, so that the research and development of the high-temperature-resistant well cementation cement slurry system have special significance for the development of oil and gas resources in China.
After cementing, the casing-cement sheath-formation will form a cementing body, i.e. a cementing barrier. The well cementation barrier is subjected to various loads in the production process of an oil gas well, so that a well cementation barrier sealing system fails. Therefore, the well cementation cement slurry not only has the requirement of meeting the requirements of pipe column sealing and interlayer sealing, but also needs to be capable of resisting the damage of underground complex operation load, and simultaneously preventing the gas channeling problem and the long-term integrity of cement stone in the well cementation operation process, so that the requirements of oil-gas well cementing and subsequent oil-gas production can be fully met.
At present, rubber particles, fibers or latex and the like are added into cement paste as main methods for improving the toughness of the set cement. However, the rubber particles and the fibers have high cost, and the rheological property of the cement paste is deteriorated, and the sedimentation stability of the cement paste at high temperature is damaged; the preparation of the latex is complex, and the compatibility of the latex and other well cementation additives is poor.
Disclosure of Invention
In order to overcome the defects and shortcomings in the prior art, the invention provides a high-temperature-resistant toughness well cementation cement slurry system, and aims to solve the problems of strength degradation and insufficient toughness of set cement under a high-temperature condition. The high-temperature-resistant toughness well cementation cement slurry system has the advantages of high-temperature-resistant strength degradation and high toughness, can effectively relieve the problems of strength degradation and insufficient toughness of set cement under a high-temperature condition, and meets the well cementation requirement of oil and gas wells.
In order to solve the problems in the prior art, the invention is realized by the following technical scheme.
The invention provides a high-temperature-resistant tough well cementation cement slurry system which comprises the following raw materials in percentage by weight:
low hydration heat cement: 47.5wt% -60.5 wt%;
high temperature strength stabilizing material: 25wt% -30 wt%;
high-temperature strength reinforcing material: 10wt% -15 wt%;
high-temperature toughening material: 2wt% -5 wt%;
high-temperature stabilizer: 2wt%;
dispersing agent: 0.5wt%
The high-temperature strength reinforcing material is a mixture formed by mixing silicon nitride micro powder and organic silicon resin micro powder; the high-temperature toughening material is polyether-ether-ketone resin.
The high-temperature strength reinforcing material is a mixture formed by mixing silicon nitride micro powder and organic silicon resin micro powder according to the proportion of 1:1.
C of the low hydration heat cement 2 The S content is more than or equal to 40 percent, and the specific surface area is 280-330m 2 The hydration heat is less than or equal to 240kJ/Kg after 7 days.
The high-temperature strength stable material is waste refractory brick powder, siO 2 The content is more than or equal to 95 percent, and the powder fineness is more than or equal to 800 meshes.
The organic silicon resin micro powder is white powder, the content of active substances is more than 99 percent, and the fineness of the powder is more than or equal to 800 meshes.
The high-temperature stabilizer is clay mineral.
The dispersant is an aldehyde ketone condensate.
Compared with the prior art, the beneficial technical effects brought by the invention are as follows:
1. the well cementation cement slurry system of the invention has good high temperature admixture adaptability and high compressive strength. The low-heat cement has better compressive strength stability and admixture adaptability under the condition of high-temperature hydrothermal environment, the content of dicalcium silicate in the low-heat cement is high, the specific surface area of the cement is small, the hydration temperature under the high-temperature condition is slower, the content of calcium hydroxide in a hydration product is lower, the required high-temperature strength stabilizer and high-temperature strength enhancer are less in dosage, the uniformity of the cement hydration product is improved, and the high-temperature strength stability of the high-temperature well cementation cement is effectively improved by improving the distribution of microscopic and mesoscopic structures of the cement high-temperature hydration product.
2. The waste refractory brick powder is used as a high-temperature strength stable material, has the advantages of environmental protection and low cost, mainly contains silicon dioxide as a main component, meets the performance requirements of high-temperature well cementing materials in terms of components, and can effectively recycle solid wastes.
3. The high-temperature reinforcing material has strong high-temperature resistance, can resist thermal shock when added into the admixture of the oil well cement, improves the high-temperature strength, and prevents the strength decay of the set cement under the high-temperature environment; the added organic silicon resin has small grain size, the main chain structure of the molecule is-O-Si-O-, the silicon-oxygen bond is stable and is not easy to break, the organic silicon resin can play a role in filling in cement, and the number and the size of pores are reduced, so that the set cement has high temperature resistance and does not decay in strength.
4. In the cement slurry reaction process, the high-temperature toughening particles and cement slurry particles are arranged between the high-temperature toughening particles and the cement slurry particles. Mutually interpenetrated and mutually aggregated, thereby improving the bonding strength among hydration products in the matrix. Because the structure of the high-temperature toughening particles has a strong flexible effect, the stress is relatively dispersed, the brittleness of the set cement is reduced, and the elastic toughness of the set cement is improved to a certain extent.
5. The invention ensures the calcium-silicon ratio and high-temperature strength of the cement paste system by utilizing the characteristics of high silica content, large specific surface area, high surface activity and the like of the waste refractory bricks. The high-temperature reinforced material is formed by the mutual matching of organic groups and inorganic structures, so that the mechanical property and flexibility of the material are enhanced. The high-temperature toughness material is a high polymer consisting of a repeating unit containing one ketone bond and two ether bonds in a main chain structure, and the special structure of the high-temperature toughness material can not only improve the flexibility of the material, but also enhance the mechanical strength of the material to a certain extent. According to the synergistic interaction principle, the organic material and the inorganic material are matched with each other, so that the material has the characteristics of environmental protection, high temperature resistance, high mechanical strength, good flexibility and low cost.
Drawings
FIG. 1 is a thickening test curve for sample # 1 from example 1;
FIG. 2 is a thickening test curve for sample # 2 from example 1;
FIG. 3 is a thickening test curve for sample # 3 from example 1.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to specific embodiments, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the following embodiments, the low hydration heat cement is provided by Jiahua special cement company Limited, the high temperature retarder and the high temperature fluid loss additive are provided by Sichuan Asahi Ran Hongchen New Material Limited, and the high temperature stabilizer is clay mineral. The high-temperature retarder is an AMPS polymer; 2-acrylamido-2-methylpropanesulfonic acid polymer as high temperature fluid loss agent; the dispersant is aldehyde ketone condensate which is not specifically shown in the examples and is in weight percentage.
Example 1
As a preferred embodiment of the invention, the embodiment discloses a high temperature resistant toughness well cementation cement slurry system which adopts low hydration heat cement as basic cement, wherein C is 2 The S content is more than or equal to 40 percent, and the specific surface area is 280-330m 2 The hydration heat is less than or equal to 240kJ/Kg after 7 days; the specific components are shown in the following table:
the high-temperature toughening material is polyether-ether-ketone resin; the high-temperature strength stabilizing material is waste refractory brick powder or SiO 2 The content is more than or equal to 95 percent, and the powder fineness is more than or equal to 800 meshes. The organic silicon resin micro powder is white powder, the content of active substances is more than 99 percent, and the fineness of the powder is more than or equal to 800 meshes. The high-temperature stabilizer is clay. The raw materials are mixed according to the specific component proportion in the table, and a well cementation cement slurry system with the water cement ratio of 0.44 is prepared according to GB/T19139.
Example 2
As another preferred embodiment of the present invention, the present embodiment discloses a high temperature toughness resistant well cementation cement slurry system, which uses low hydration heat cement as the basic cement, wherein C 2 The S content is more than or equal to 40 percent, and the specific surface area is 280-330m 2 Per Kg, the heat of hydration is less than or equal to 7 days240kJ/kg; the specific components are shown in the following table:
the high-temperature toughening material is polyether-ether-ketone resin; the high-temperature strength stable material is waste refractory brick powder, siO 2 The content is more than or equal to 95 percent, and the powder fineness is more than or equal to 800 meshes. The organic silicon resin micro powder is white powder, the content of active substances is more than 99 percent, and the fineness of the powder is more than or equal to 800 meshes. The high-temperature stabilizer is clay. The raw materials are mixed according to the specific component proportion in the table, and a well cementation cement slurry system with the water cement ratio of 0.44 is prepared according to GB/T19139.
Example 3
As another preferred embodiment of the present invention, the present embodiment discloses a high temperature toughness resistant well cementation cement slurry system, which uses low hydration heat cement as the basic cement, wherein C 2 The S content is more than or equal to 40 percent, and the specific surface area is 280-330m 2 The hydration heat is less than or equal to 240kJ/Kg after 7 days; the specific components are shown in the following table:
the high-temperature toughening material is polyether-ether-ketone resin; the high-temperature strength stabilizing material is waste refractory brick powder or SiO 2 The content is more than or equal to 95 percent, and the powder fineness is more than or equal to 800 meshes. The organic silicon resin micro powder is white powder, the content of active substances is more than 99 percent, and the fineness of the powder is more than or equal to 800 meshes. The high-temperature stabilizer is clay. The raw materials are taken according to the specific component proportion in the table and mixed, and a well cementation cement slurry system with the water cement ratio of 0.44 is prepared according to GB/T19139.
Comparative example 1: the scheme of the comparative example is that the conventional high-temperature well cementation cement comprises the specific components of 62.5% of G-grade high-resistance oil well cement, 35% of silica sand, 2% of high-temperature stabilizing agent and 0.5% of dispersing agent. The water-cement ratio was 0.44.
Example 4
As another preferred example of the present invention, in this example, the cement paste samples obtained in examples 1 to 3 and comparative example 1 were poured into a copper mold and molded, and then placed into a high temperature curing kettle for curing at 150 ℃, 210 ℃ and 260 ℃ for 2d, 7d and 28d. The compressive strength test is carried out by adopting an NYSQ-2017 compression testing machine, and the detection results are shown in the following table:
as can be seen from the data in the table above, the compressive strength of examples 1-3 did not deteriorate after curing at each curing temperature for a certain age period, while the strength of comparative example 1 deteriorated. The cement paste system provided by the technical scheme of the invention has higher internal structure compactness and better high-temperature resistance.
Example 5
As another preferred example of the present invention, in this example, the cement paste samples obtained in examples 1 to 3 and comparative example 1 were poured into a copper mold and molded, and then cured in a high temperature curing kettle at 150 ℃, 210 ℃ and 260 ℃ for a curing period of 14 days. Coring the cured and molded cement stone, and then testing the triaxial mechanical property. According to GB/T50266-2013 'engineering rock mass test method Standard', the testing result of the RTR-1000 type triaxial rock mechanical test of the equipment used in the experiment is shown in the following table:
from the test results data in the table above, it can be seen that: in a reasonable regulation range, compared with the comparative example 1, the elastic modulus of the set cement is obviously reduced in the examples 1 to 3 under the same condition (which shows that the mechanical deformation capability of the set cement is improved, and the micro-annular space can be better inhibited from forming). The problem of insufficient toughness of the cement stone in a high-temperature environment can be effectively solved.
Example 6
In this example, the cement slurry thickening time obtained in example 1 was examined as a further preferred embodiment of the present invention. 3 portions of the grout samples of example 1 were subjected to a 210 ℃ high temperature thickening test, the thickening time being as indicated in the table below, the thickening test curves being shown in FIG. 1, FIG. 2 and FIG. 3:
from the experimental data in the table above and the accompanying figures 1, 2 and 3, it can be seen that: the thickening time of the high temperature toughness resistant well cementation cement system obtained in the example 1 is adjustable, which shows that the components in the high temperature toughness resistant well cementation cement slurry system have good compatibility with a high temperature retarder, a fluid loss agent and the like, the pumping time is controllable, and the construction safety of high temperature well cementation operation is improved.
According to the technical scheme, the specific high-temperature strength stabilizer and the specific high-temperature strength reinforcing agent are added into the cementing material, so that the toughness and the high-temperature strength stability of the well cementation cement are effectively improved, and the obtained product of the solidified cement paste has excellent high-temperature resistance and toughness and can meet the performance requirements of the cement paste of high-temperature well cementation engineering.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and any simple modifications and equivalent variations of the above embodiment according to the technical spirit of the present invention are within the scope of the present invention.
Claims (5)
1. The high-temperature-resistant tough well cementation cement slurry system is characterized by comprising the following raw materials in percentage by weight:
low hydration heat cement: 47.5wt% -60.5 wt%;
high temperature strength stabilizing material: 25wt% -30 wt%;
high-temperature strength reinforcing material: 10wt% -15 wt%;
high-temperature toughening material: 2wt% -5 wt%;
high-temperature stabilizer: 2wt%;
dispersing agent: 0.5 percent;
the high-temperature strength reinforcing material is a mixture formed by mixing silicon nitride micro powder and organic silicon resin micro powder; the high-temperature toughening material is polyether-ether-ketone resin; the high-temperature strength stable material is waste refractory brick powder, siO 2 The content is more than or equal to 95 percent, and the powder fineness is more than or equal to 800 meshes; the high-temperature stabilizer is clay mineral.
2. The high temperature resistant tough well cementing cement slurry system of claim 1, wherein: the high-temperature strength reinforcing material is a mixture formed by mixing silicon nitride micro powder and organic silicon resin micro powder according to the proportion of 1:1.
3. The high temperature resistant tough well cementation cement slurry system of claim 1 or 2, wherein: c of the low hydration heat cement 2 The S content is more than or equal to 40 percent, and the specific surface area is 280-330m 2 The hydration heat is less than or equal to 240kJ/Kg after 7 days.
4. The high temperature resistant tough well cementation cement slurry system of claim 1 or 2, wherein: the organic silicon resin micro powder is white powder, the content of active substances is more than 99 percent, and the fineness of the powder is more than or equal to 800 meshes.
5. The high temperature resistant tough well cementation cement slurry system of claim 1 or 2, wherein: the dispersant is an aldehyde ketone condensate.
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